<!DOCTYPE html>
<html lang="zh-CN">
<head>
	<meta charset="UTF-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>Background</title>
</head>
<body>
	<iframe id="theFrame" src="sandbox.html" style="display: none"></iframe>
</body>
</html>